gravity bin

例句：

1. 1.The gravity bin is used to store the heavy objects, such as books and furniture.
   重力桶用于存储重物，如书籍和家具。
2. 2.The gravity bin is a useful tool for measuring the weight of objects.
   重力桶是一种测量物体重量的有用工具。
3. 3. The gravity bin can be used to store liquids that are heavier than air, such as oil and gas.
   重力桶可以用来存储比空气重的液体，如油和气体。